Total Dissolved Solids

{
  "id": "MLC-T-ENV-028270",
  "term": "Total Dissolved Solids",
  "field": "Environment",
  "definition": "1. The quantity of dissolved material in a given volume of water.\n\n2. All of the dissolved solids in a water. TDS is measured on a sample of water that has passed through a very fine mesh filter to remove suspended solids. The water passing through the filter is evaporated and the residue represents the dissolved solids.\n\n3. All material that passes the standard glass river filter; now called total filterable residue. Term is used to reflect salinity.\n\n4. Total dissolved solids means the total dissolved (filterable) solids present in a fluid as determined by use of the method specified in Title 40 of the Code of Federal Regulations (40 CFR) Part 136. UIC regulations protect water which has less than 10,000 milligrams per liter (mg/l) total dissolved solids. To put this value into perspective, most drinking water averages between 200 and 300 milligrams per liter total dissolved solids and water with TDS greater than 500 milligrams per liter is not recommended for human consumption. Therefore 10,000 mg/l is a very conservative value.\n\n5. Total dissolved (filterable) solids as determined by use of the method specified in 40 CFR part 136. [40 CFR 122.2 (CFR 2013)][40 CFR 144.3 (CFR 2018)]\n\n6. Nonfilterable residue.\n\n7. Total dissolved (filterable) solids in water as determined by use of the method specified in 40 CFR part 136. [40 CFR 191.22 (CFR 2018)]\n\n8. The weight of solids remaining after a well-mixed sample has been filtered through a standard glass filter and the resultant filtrate is evaporated and dried to a constant weight at 180 deg C [Original source: https://ofmpub.epa.gov/sor_internet/registry/substreg/searchandretrieve/substancesearch/search.do?details=displayDetails&selectedSubstanceId=79555].",
  "abbreviation": "TDS",
  "subject": "Water",
  "references": [
    "Environmental Issues Terms & Acronyms; Pesticides Glossary; Glossary: Study of the Potential Impacts of Hydraulic Fracturing on Drinking Water Resources; EPA Study of the Potential Impacts of Hydraulic Fracturing on Drinking Water Resources: Progress Report at http://www.epa.gov/hfstudy/pdfs/hf-report20121214.pdf",
    "Drinking Water Technical & Legal Terms",
    "Terms of Environment",
    "Underground Injection Control Terms",
    "40 CFR 146.3 (CFR 2018)",
    "40 CFR 412.2 (CFR 2017)",
    "40 CFR 197.12 (CFR 2019)",
    "Federal LCA Commons Elementary Flow List for Life Cycle Assessment"
  ],
  "url": "https://mlchart.com/terminology/environment/total-dissolved-solids/"
}